WARNING: This page is about a different car, the 2018 Nissan Titan XD and 2018 Nissan Titan. However, it is still accessible from the selected car via links, so may be relevant.
Active grille shutter is located at front bumper lower opening, and according to the signal from ECM it operates actuator
to perform open/close movement of flap
to control the amount of air flow taken into engine compartment.